The next day, the Trio discuss their belief that Umbridge has been reading Harry's mail. Hermione suggests that the reason why [[Recap/HarryPotterAndTheOrderOfThePhoenixC14PercyAndPadfoot Filch was wrongly told Harry was ordering Dungbombs]] was an excuse by Umbridge to get his letter confiscated.
Harry has Quidditch practice that evening. Umbridge contemplated refusing to give the Gryffindor Quidditch team permission to stay active, but she has relented. It's not much fun practicing in rainy weather, least of all for Fred and George. One of the Skiving Snackboxes they have recently tested had an annoying side-effect of producing boils on their buttocks. Harry's scar again prickles and he feels a fleeting feeling of anger and impatience that is nothing to do with what's going on around him. He discusses it with Ron. [[Recap/HarryPotterAndTheOrderOfThePhoenixC13DetentionWithDolores When his scar prickled in Umbridge's office]], he instead felt a fleeting feeling of happiness. It seems that his scar hurts when Voldemort feels a surge of emotion, even if he is nowhere nearby.
That night, Harry falls asleep by the Common Room fire and again dreams about the mysterious corridor. He is woken up by Dobby, who has come to give back Hedwig. He also reveals that he's the one who's been taking [[Recap/HarryPotterAndTheOrderOfThePhoenixC13DetentionWithDolores all the hats and clothes Hermione has been leaving around Gryffindor Tower]]. Harry asks Dobby for help finding a place where they could do defence lessons. To his surprise, Dobby has he perfect idea: the Room of Requirement. It is a secret room which will only appear to someone if they are in dire need of something, and will supply anything they want. Harry realise that [[Recap/HarryPotterAndTheGobletOfFireC23TheYuleBall Dumbledore once mentioned the room in passing]].
The defence group has their first meeting in the Room of Requirement. The group agree unanimously to elect Harry as their leader and to call themselves "Dumbledore's Army" (the DA). It's a tongue-in-cheek reference to Fudge's delusional fear of Dumbledore creating his own army. They have their first lesson, in which Harry teachers them to disarm people. Cho, who has brought along [[ChekhovsGun her reluctant friend Marietta]], again hints that she fancies Harry in return.